#include <stdio.h>
main() {
    int a, b; 
    a = 1;
    b = 3;
    printf("Originally, a: %d, b: %d\n", a, b); 

    b = a + b;
    a = b - a;
    b = b - a; 
    printf("Now, a: %d, b: %d\n", a, b); 
}
